If at all possible I would rebuild that original carb. What is frozen in it? Did you use a JIS screwdriver or did you strip the factory screws? I have one of the knockoff carbs and it would start and sounded great until underway where it seemed to be way over fueled where it would just bog down with no power trying to attain a higher speed. That is just my experience though, others have used them and had great results. I didn't feel like playing with the jets, I wanted to ride so I stuck my old one back on. I was just trying to see if it was a performance enhancer and for me it wasn't.